I'm so sick of it!!!!!! *vent*

Sharissa
So my mother is a horrible person, now before we all jump on the wagon and start bashing me and telling me I should appreciate her cause she birthed me. Let me explain. 
So, my mother is a horrid person. She's a very strong minded, willed and wealthy individual. But since I'm in the process of buying a new house I currently stay with her. My mother is so kind to my two younger sisters. My other sister Sam and I, are just a bother to her. She literally yells and screams and tells you horrible things. Now, I do my part yes, I give her money I help around the house I keep my area clean and clean up after my kid and even help her with my sisters. But for some reason it's never enough and she has to find a reason to fight with me. Even when I don't want to interact with her she will pick and push and prod until I do. 
Last night I came home from work, mind you she just found I'm pregnant. The first thing she says is "did they tell you, you're going to lose it because you were spotting?" And when I told her no and informed her that the pregnancy is going well she just scoffed and said "that's nice" and walked away. Two minuets later she comes into my room and I'm changing and she laughs and goes "oh my god you're tiring into a fat pig you know that? Disgusting" and walked away. I didn't say anything I continued to put my pjs on so that I could leave. She comes back again while I'm going through my closet trying to find my damn slipper and goes "you know maybe you'll be a better mom this time around" still I didn't answer and I just ended up settling on my sneakers. When I was leaving she followed me out and says "oh that's your new car?! I don't see why you did that such a waste cause you're not going to take care of it." And walked inside 
Now I didn't do anything to Provoke her. She's been like this since I moved in which was almost two weeks ago. I'm not a horrible mother, I work a lot and he never goes with out. He has everything he needs and he's extremely happy. I just don't understand why she has to always be that way with me 🙄🙄🙄🙄